asbestos attention beware black building yard construction area danger directions do not enter finger gesture glove hand icon illustration industrial logo pictogram sign signs stay away stay out thumb warning 3D abstract backdrop background blue cement closeup concrete construction decay design detail exterior grainy graphic grunge material old plaster rock rough scrapbooking stone stucco surface texture urban wall weathered white dark gray grey brown Dirt sepia purple architecture blank modern paint pastel pattern plain wallpaper whitewash pink